[gnome-calculator/60-split-out-a-backend-library: 15/47] gcalc: add MathEquation interface

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit f05a142fd0af3df6b4bb517e5aa3060dee33d62e
Author: Daniel Espinosa <esodan gmail com>
Date:   Wed Dec 5 18:54:11 2018 -0600

    gcalc: add MathEquation interface

 gcalc/gcalc-math-equation.vala | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
---
diff --git a/gcalc/gcalc-math-equation.vala b/gcalc/gcalc-math-equation.vala
new file mode 100644
index 00000000..7c4f5fcd
--- /dev/null
+++ b/gcalc/gcalc-math-equation.vala
@@ -0,0 +1,26 @@
+/* gcalc-math-equation.vala
+ *
+ * Copyright (C) 2018  Daniel Espinosa <esodan gmail com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *      Daniel Espinosa <esodan gmail com>
+ */
+public interface GCalc.MathEquation : Object {
+  public abstract Solver solver { get; }
+  public abstract string expresion { get; }
+  public abstract Result resolve ();
+}
+